SMS scnews item created by Alex Sherman at Mon 6 Nov 2023 0945
Type: Seminar
Distribution: World
Expiry: 5 Feb 2024
Calendar1: 10 Nov 2023 1200-1300
CalLoc1: Carslaw 173
CalTitle1: Algebra Seminar: A Deligne-Simpson problem for irregular G-connections over P^1
Auth: alexs@desktop-h8gjltm.staff.wireless.sydney.edu.au (ashe8718) in SMS-SAML

Algebra Seminar: Konstantin Jakob -- A Deligne-Simpson problem for irregular G-connections over P^1

Konstantin Jakob (TU Darmstadt) is speaking in the Algebra Seminar this week.  We will
go out for lunch after the talk.  

When: Friday, 10 November, 12-1pm 

Where: Carslaw 173 

Title: A Deligne-Simpson problem for irregular G-connections over P^1 

Abstract: The Deligne-Simpson problem asks for a criterion for the existence of a
connection on a punctured P^1 with prescribed singularities.  I will explain joint work
with Zhiwei Yun on a generalization of this problem for G-connections on P^1 with two
singularities, only one of which is a regular singularity, where G is any complex
reductive group.  We give a geometric and a representation-theoretic existence
criterion, and use them to solve the Deligne-Simpson problem in many cases.